5 years ago the economy was riding high on the tech boom. It was funded greatly by venture capital. This lost a lot of people a lot of money. But if the government recreated this situation, it has a the potential to return the market to it's high numbers with minimal risk to the primary investor.
We need the United States to stop with tax cuts, but keep the taxes where they are, and use the revenue to venture start up companies. The goal is to keep the invested capital in the United States. If the capital is kept domestic, then the government regroups the costs with income tax, even if the companies fail. If the companies hire and purchase domestically, the capital will be cycled within the domestic economy, strengthening it. And if the companies succeed, even better.
This will quickly get people working again. It should improve the speed and range of new products produced. And, if the capital is kept domestically, the costs will be recouped by the tax revenues it generates. And if the company succeeds, the tax revenues will be even greater, allowing for more investement and use of funds for other projects and endevours.